Bennett's Linkage
Another example of an overconstrained mechanism is Bennett's linkage, which consists of four links connected by four revolute joints.
A general spatial linkage formed from four links and four hinged joints has mobility
which is a highly constrained system.
As in the case of the Sarrus linkage, it is a particular set of dimensions that makes the Bennett linkage movable. Below is an external link to an animation of Bennett's linkage.
Read more about this topic: Overconstrained Mechanism
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